Fig. 2.

Anatomically-defined upper pons sublevels. Sagittal view shows specimen (58-year-old male) in gross (a) and in high-resolution ex vivo MRI (e) with axial blockface images (b–d), axial MRI images (f–h), and color-coded upper pons schemata (i–k). Images b–d and f–h were taken from within the subregions indicated in (a) and (e), respectively. Panels b–d, f–h, and i–k define and depict sublevels containing rostral (b, f, i), middle (c, g, j), and caudal LC (d, h, k). i–k Color code for pons schemata: locus coeruleus (blue), caudal dorsal raphe (yellow), median raphe (orange), superior cerebellar peduncle (green), and middle cerebellar peduncle (red). Scale bars = 1 cm